Fountain pen



Dec. 25, 1934. c. PFANSTIEHL 1,985,643

FOUNTAIN PEN Filed March 16, 1934 Patented Dec. 25, 1934 l v 1,985,643 IUNITED STATES PATENT OFFICE FOUNTAIN PEN cm Pfan'stiehL Highland Park,n1., asslgnor a The Parker Pen Company, Janesville, Wia, a corporationof Wisconsin Application March 16, 1934, Serial No. 715,922

8 Claims. c1. 120-41) My invention relates to fountain pens and par-Fig. is a plan view of a resilient segment emticularly to that classgenerally known as pump .ployed in aflixing the diaphragm to the end offilled in which the ink sac is eliminated and a the plunger. 1 pumpmechanism is used to draw ink into the In the drawing the numeral'lo isgenerally 5 barrel. More specifically, my invention has to do used toindicate the means employed for affixing 5 with pump fill pens utilizinga rubber diaphragm the pump to one end of the pen barrel as it is not asa part of the pump mechanism such as disthought necessary tospecifically describe the closed in the patent to Arthur 0. Dahlberg,Numvarious parts in that they are exactly similar to her 1,904,358,issued April 18, 1933. that disclosed in the co-pending Tefitapplication The pump mechanism disclosed in the drawing named above.

forming a part of this application is similar to The numeral 11indicatesa reciprocable plungthat disclosed in the co-pendingapplicationof er which actuates a diaphragm 12 which is adapt- Ivan D. Tefft,Serial Number 636,436, filed Octoed to roll upon itself when the plungeris recipber 6, 1932, the only change being in the shape and rocated,causing a reduction in the air pressure i manner of attaching the rubberdiaphragm to the within the barrel, in this manner drawing ink into 1end of the reciprocating metal sleeve or plunger. the pen- I It is to beparticularly noted that the diaphragm As stated in the preamble, thediaphragm 12 is disclosed in the said Teilt application has a fabricatedfrom purelatex and is formed on a. flanged nipple formed in the bottomend thereof, mandrel by what is commonly known as the anode I whichflanged nipple is introduced into the lower process. The said diaphragmtapers from its 2 open end of the reciprocating plunger, the flangedmid-section to the closed end and the said closed shoulder of the saidnipple engaging 'on the underend is formed in the shape of a nippledesignated side of the formed shoulders adjacent the aperas 13, therestriction of the nipple 13 forming a ture in the plunger, whichassembly, in conjunoshoulder 14, the outer diameter of that portion ition with a segment or plug which is force fitted of the diaphragm atthe shoulder being a trifle in the inside of the sleeve and pressedagainst larger than the outer diameter of the lower end the inner faceof the nipple, firmly locks the of the plunger 11. In the forming of theplunger lower end of the diaphragm to the lower end of 11, the lower endis turned inwardly to form a the plunger; shoulder 15 and a restrictedaperture 16.

l The manufacture ofadiaphragm suchas shown The assembly of thediaphragm and plunger in the Tefit and Dahlberg applicationsnecessiconsists in slipping the nipple 13 through the retatesthe use ofa molding rubber, the composistricted aperture 16 and then introducing aretion of which is not as impervious to ink as pure silient plug 17, thediameter of which is larger latex, and as pure latex cannot besuccessfully than the diameter of'the aperture 16, into the molded inthe form disclosed in the diaphragm of open end of the diaphragm andforcing said plug Dahlberg, I have conceived a method of afllxingthrough the aperture 16 to the end of the nipple.

a slightly changed form of diaphragm to the Immediately the saidresilient plug passes through plunger, which diaphragm may be made fromthe aperture 16 it expands, thus expanding the pure latex. end of thenipple and securely locking the said To more fully understand myinvention, referdiaphragm to the end of the plunger. The dia- 40 enceshould'be had tothe accompanying drawphragm is then rolled on itself asto encompass ing in which: I the lower portion of the plunger and thecomplet- Figure 1 discloses a sectional fragmentary view ed assembly isscrewed into the barrel. of t e pp e d of a o a n p n disclosing aHaving described my; invention, what I claim pump in y p d p agm isinand desire to secure by Letters Patent is: corporated; t 1. In afountain pen employing a pump fill Fig. 2 is a view partially in planand partially mechanism, a vacuum pump, means for afl'ixing in sectionwhich shows the lower end of a recipand Supporting Said pump in 5,fountain pen Barrocable plunger with diaphragm attached disrel, areciprocable plunger, a diaphragm, one end closing my improved means forattaching the diaof which is fixed to the barrel and the other end P agmto the said plunger; to the plunger, an aperture in the lower end of. ma3 s av w f y mp v d diaphra m parsaid plunger in which the closed end ofthe diatially in Section d Partially in P Dhragm is adapted to beinserted, expansible 4 is a i w al t e l e o gmeansadapted to be forcedthroughthe aperture and in the lower end or the plunger into theinserted end of the diaphragm, the resulting expansion of the expansiblemeans and diaphragm end efiecting a lock between the said plunger anddiaphragm.

2. In a fountain pen the combination of a barrel, a plunger operablewithin said barrel and having an opening at its lower end, a diaphragmsecured to said barrel, a portion of said diaphragm passing through andreceived within said plunger opening, and self-expansiblemeansexteriorly insertable through said diaphragm portion for securingthediaphragm to said plunger for operating movement therewith.

3. In a fountain pen the combination of a barrel employing a pump fillmechanism, means for aiiixing and supporting said mechanism in saidbarrel, a reciprocable plunger having an opening, a diaphragm having anipple portion formed therein, the nipple portion being insertablethrough said plunger opening, and means exteriorly insertable with saiddiaphragm nipple for automatically locking said nipple portion withinsaid .plunger to permit operation 'of said diaphragm by said plunger.

4. In a fountain pen the combination of a barrel, a reciprocable plungeroperable within said barrel, and having an opening in its end withinsaid barrel, a diaphragm secured to said barrel and having a hollowportion insertable through said plunger opening and within said plunger,an expansible plug insertable through said plunger opening and withinsaid hollow diaphragm portion, said plug being. adapted to expand thediaphragm portion within the plunger beyond the circumference of theplunger opening between the plunger and diamay be forced through saidplunger opening it.

will expand beyond the side of 'said opening when inserted in saidextension to prevent withdrawal of said extension during operation ofsaid plunger.

6. A filling mechanism for a fountain pen of the pump filled kind whichcomprises a flexible diaphragm of an elongated form having a closed andreduced end portion, a plunger having an aperture in one end adapted toreceive said reduced diaphragm end portion, said plunger being adaptedfor actuation to flex said diaphragm, and means for securely lockingsaid diaphragm to said plunger which includes an expansible elementinserted within said reduced diaphragm end portion through said plungeropening and of such size that it is contracted in being so forcedthrough said plunger opening and expan when as an ink reservoir, andfilling mechanism which includes a flexible diaphragm, means forsecuring the diaphragm peripherally to said barrel to close one end ofsaid barrel and the reservoir, a member associated with said end of thebarrel for flexing said diaphragm, said member being connected to saiddiaphragm at a central portion thereof, said member having an openingtherein to receive an imperforate part of said diaphragm, and resilientmeans of greater size than said opening adapted to be inserted throughthe opening-received part of said diaphragm within said member openingand adapted to expand when so inserted to prevent withdrawal of saiddiaphragm from said member and to securely lock said parts together.

8. A filling mechanism for a fountain pen of the pump-fill type whichcomprises a reciprocable plunger, a diaphragm, said plunger having anaperture in one end thereof and said diaphragm having a reduced andclosed end portion which is received within said plunger opening, andexpansible means adapted to be forced within said reduced end portion ofsaid diaphragm through said aperture in said plunger into the insertedend portion of said diaphragm, said expansible means being adapted tocontract when being, forced through said aperture and to expand wheninserted therein to eifect a lock between said plunger and diaphragm.

CARL PFANS'I'IEHL.

